Moving one file share from one file server to another file server in DFS.......

Hi , In our Domain environment, we have multiple file servers, the shares of which are managed in DFS. One share of 200 GB has to be moved from one file server to another file server in which available free space is more and the 200 GB Share has to be increased in quota size to 500 GB.We are using robocopy and the copy got finished.
This share has 3 groups named based on the file server name with Full, Modify and Read only .Each of which has around 100 users.After copying to the new file server, now it is taking too much time for me to assign these users back to the new share and setting the permissions to the newly created groups based on the new file server.

I need a script to automate the addition of the users in one group to another group without adding manually in windows 2003/2008

After completing this only , I have to change the DFS LInk pointing to the new file server.
Any help is greatly appreciated

Nothing happened with the existing group; due to the naming convention followed for the movement of the shares in the file server, it is mandatory to assign the users in the old group to the new group with the related name of the new file server

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